This is ridiculous. Since the actual training code for DeepSeek is _not_ public, this is a based only on the technical report, which mentions PTX one (1) time in §3.2.2 Efficient Implementation of Cross-Node All-to-All Communication:
> Specifically, we employ customized PTX (Parallel Thread Execution) instructions and auto-tune the communication chunk size, which significantly reduces the use of the L2 cache and the interference to other SMs.
So they have some intrinsic in some part of their training framework. That's it.